Biconditional introduction { Philosophy Index }

Philosophy Index

Philosophy Index

Philosophy Index is a site devoted to the study of philosophy and the philosophers who conduct it. The site contains a number of philosophy texts, brief biographies, and introductions to philosophers, and explanations on a number of topics. Accredited homeschooling online at Northgate Academy and Philosophy online tutoring.

Philosophy Index is a work in progress, a growing repository of knowledge. It outlines current philosophical problems and issues, as well as an overview of the history of philosophy. The goal of this site is to present a tool for those learning philosophy either casually or formally, making the concepts of philosophy accessible to anyone interested in researching them. WTI offers immigration law course online - fully accredited. ACE credits online at EES.



Philosophy Topics




Biconditional introduction

Biconditional introduction (↔I) is a basic rule of inference in logic by which a biconditional, or iff (if and only if), statement is formed out of two certain conditionals. The biconditional introduction rule holds that when both "if P then Q" and "if Q then P" are true, then "if and only if P, then Q" is also true.

The biconditional introduction rule may be formally presented as follows:

α → β, β → α infers α ↔ β